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Q.

Emergency signals and danger signals are in which of the following colours?


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a

Orange

b

Green

c

Yellow

d

Red 

answer is D.

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Detailed Solution

Emergency signals and danger signals are in red colours.
Here, we know that the emergency signals and danger signals are red in colour since red colour is scattered least by the air molecules as the wavelength of red colour is less. Also red has a very high intensity so it is visible from a long distance.
 
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